Improvement in machines for sewing boots and shoes



' E; HAMM'. Machine for Sewing Boots and Shoes.

' Patented Sept. 16., I879.

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EDWIN HAMM, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THEO- DORE H.GONDERMAN, TRUSTEE FOR PRENTIOE P. GUSTIN-E, ROBERT BISHOP, FRANCISHUTH, BENJAMIN ORABTREE, AND JAMES M. DALTON,

ALL OF SAME PLACE.

IMPROVEMENT IN MACHINES FOR SEWING BOOTS AND SHOES.

Specification forming part of Letters Patent No. 219,578, datedSeptember 16, 1879 application filed April 4, 1879.

To all whom it may concern.-

Be it known that I, EDWIN HAMM, of the city of Philadelphia, and Stateof Pennsylvania, have invented a new and useful Improvement in Machinesfor Sewing Boots and Shoes, of which the following is a specification.

My invention relates to certain improvements in sewing-machines forwhich Letters Patent of the United States No. 188,360 were granted toSamuel. Heushall on the 13th day of March, 1877, which invention isprincipally adapted for sewing the soles to the uppers of boots andshoes.

The object of my improvement is to furnish the said machine with anautomatic operating clamp or jaws that will guide and hold the workwhile the needle is passing through the work and drawing tight thestitch.

This invention consists in the combination of a clamp comprising twojaws with mechanism for operating the same,-as will be herein- B, theneedle-bar; F, the driving-shaft, thelatter carrying the cam M and diskE. This disk E, by means of theconnecting-rod D, operates the needle-barB and needle N in the usual manner.

H is a metal bar, fitted to slide verticallyin the frame A. To this baris cast a rest, R, in which is drilled a hole for the needle, (seedotted lines,) and also cut a V-shaped notch, Y.

K is a lever, pivoted" on a pin, 70, fastened in a stand fixed to frameA. (See Fig. 1.) The right-hand end of lever K is constructed with ajaw, in which works a pin fastened to the bar H. To the opposite end oflever K is pivoted an upright, L, and in this upright L is a pin, a,against which presses the elliptic spring as is usual on the presserbarsof sewing-ma chines. The bar J is also provided with a camlever, P, andis fitted to slide vertically in the frame A. At the lower part of bar Jis a small jaw, ,g, in which fits one end of the small lever 01. Itsopposite end is pivoted to the end of arm 0, fastened to the slide-barH. The middle of lever 01 is constructed with a small slot, S, in whichfits a small pin fastened in a stand fixed to the frame A.

The operation is as follows: The shoe to be sewed having been properlylasted, the edge of the shoe-sole is rested in the notch Y of therest'R, when the cam-lever P is turned to the position shown in thedrawings, and as the shaft F and cam M move, the lever K will be actedupon by the upright L, and cause the bar H and rest It to rise, and theraising of the arm 0 will cause the end of lever d in jaw g to drop.This will allow the spiral spring on bar J to force it down, and thepoint G will enter the channel of the sole just before the needleenters, and the sole will be firmly held between the rest R and point G,guide the needle into the channel, and hold the shoe while the needleperforates the sole and upper of the shoe and forms the stitch. When themovements of the cam M (which is made eccentric on its edge, a portionbeing cut away) will allow the upright L to rise by the action of springa, lever K will force down the bar H and rest R, and, by the action ofthe lever 61 on bar. J, the point G willbe raised as the rest It isdepressed, and just as the sole or shoe is fed forward for anotherstitch, when the rest It and point G are closed, as before described.

The clamp, consisting of the parts R and G, is only opened just at thetime when the feed moves the shoe forward for a stitch.

It should be understood that the work is fed toward the needle from theright-hand side of The parts, as shown and described, sepathe needle,and the feed-jaws (such as shown rately, 1 do not claim 5 but anddescribed in Patent No. 188,360) must be As my invention I claimon thatside, for the reasons, the thread form- In sewing-machines, a clamp forholding the ing the stitch being waxed, if the jaws act work, composedof point G and perforated upon the stitches the wax would cause themrest It, in combination with the mechanism to stick; but by having thejaws on the rightfor operating the same, as shown and dehand side of theneedle this is avoided. scribed, and for the purpose specified.

Fig. 3 shows a grooved cam, which in prac- EDWIN HAMM. tice I prefer touse, as by its use the spring 0 Witnesses: may be dispensed with, andthe bar H will be JOHN SHINN,

operated both Ways positively. NEWTON E. ROEDEL.

